The new Exit AB bat by Combat, powered by PowerMetal, will provide you enhanced durability, improved performance and better feel over traditional aluminum bats. Your baseball will EXIT right out of the park with this bat! PowerMetal alloys utilize the Hall-Petch Effect to achieve dramatic increases in mechanical properties. As grains get smaller, material properties improve, and PowerMetal's grains are nano-scale. •PowerMetal Alloy: Developed For Nuclear, Defense and Military Applications •2 5/8" Diameter •Unique Metallic Look •Increase in Metal Durability •Enhanced Performance •Improved Abrasion & Wear